Parents in California say their 8-year-old, who has been diagnosed with autism, was attacked by a school bus driver.

Officers with the Vacaville Police Department arrested 64-year-old Kim Klopson in February after reviewing bus surveillance video that showed the alleged abuse of the second-grader at Browns Valley Elementary. She has pleaded not guilty.

Vacaville police Lt. Mark Donaldson said the footage showed the child was terrified, crying and begging the bus driver to stop.

This week, the footage was released to KOVR by an attorney representing the child's family. The family is preparing to sue the Vacaville School District.

“And if you stick your feet out again to keep her from moving, you are going to be on the window. Got it?” Klopson tell the girl as surveillance cameras roll.

As other special-needs students exit the bus, Klopson grabs the 8-year-old's backpack and orders her to stay seated.

“Because you’re misbehaving, as always,” she said. “Cause she’s acting like she’s younger than her baby sister. She’s only two, how old are you?"

The girl is heard crying hysterically as the driver mocks her. A teacher's aide had come to the bus door to get the girl, but she walks away and Klopson closes the door.

That's when it gets physical.

For four or five minutes, Klopson is seen yanking the girl up and down, ripping off her jacket before dragging her off the bus.

"It's absolutely bone-chilling to see the way this adult woman treats this child," said attorney Micha Star Liberty. “What you’re seeing is horrific and abuse by an adult bus driver."

While the district claims it fired the driver immediately, the family has questions about how she was trained.

“The district needs to not just train its employees but make sure that training is effective,” said Liberty.

In a statement, the district said in part: “Every bus driver has an annual evaluation that includes a ride along with a supervisor. Klopson had hundreds of hours of professional development training, including special education training.”